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Impressum
Stephan F. Haupt
sth AT streckenflug DOT at
---
Unterstützt von:
Verein streckenflug.at
Pottendorferstrasse 253
2700 Wr. Neustadt
Modelle
Alles über die verschiedenen PIK 20 Typen


PIK 20E
the pik 20E was initialy designed by Jukka Tervamaki. he buildt an Experimental Motorglider JT-6, OH-520X
after in 1975 an agreement was signed between me and Eiri Avion to develop a retractable engine installation for the PIK 20B glider.
Hannu Korhonen and Markku Hiedanpää, took care of converting the JT-6 ideas and mechanisms into a production model based on the PIK 20D.

Self launch version! First flew October 1976. This had a manually retractable 2-stroke engine driving a wooden Hoftman prop. Originally a 30hp Kohler the engine was changed to the ubiqious Roxtax 503 rated at 43hp. I gather that the 503 was actually developed for the 20E. The wings are slightly swept-back and fuse thickened. LD still around 40.

Eiri Avion produced over 100 machines in Finland, of which 90 percent were exports. They later sold the molds and production tooling to Siren Aviation in France, where production continued for several years.

Built by Eiri-Avion in Finland, the PIK-20E is a sailplane with a two-cylinder 43-horsepower, retractable engine. It is made of carbon fiber with sandwich construction. In this unique configuration, it takes off and climbs to altitude on its own. After reaching the desired altitude, the engine is shut down and folded back into the fuselage and the aircraft is then operated as a conventional sailplane.

Construction of the PIK-20E series was rather unusual. The factory used high-temperature epoxies cured in an autoclave, making the structure resistant to deformation with age. Unlike todayu2019s normal practice of laying glass over gelcoat in a mold, the PIK-20E was built without gelcoat. The finish is the result of smooth glass lay-up, a small amount of filler, and an acrylic enamel paint.

The sailplane was 21.4 feet long and had a wingspan of 49.2 feet. It featured a wooden, fixed-pitch propeller, a roomy cockpit, wingtip wheels, and a steerable tailwheel.

http://www.dfrc.nasa.gov
http://www.icon.fi/~jtki/motorgli.html
http://www.cofc.co.nz/pik20/pik20.html

PIK 20D
As per C plus the flaps are back -12 to +20. More carbon and contest sealed. Flaps and ailerons centre-hinged for better performance. Tailplane moved forward 12 cm, thicker fuselage fairings, nose sharper. Automatic trim with flap. Claimed LD of 42. However Dick Johnson flight tested an example ( Soaring Jan 79 ) and found the performance of the D was actually worse than earlier B model. It is suspected that the wing mould had warped over time and the wing was manufactured around 6% thicker than it should be. I don't know if how many examples of the D were affected.

I think this has to do with the fire, but i am not shure

PIK 20C
Like the PIK 20B but without the flaps.

PIK 20B
As per A, but optional carbon fibre spar saving 30Kg overall. Also has aileron interconnect allowing the ailerons to move with the flaps over the first +/- 8degs. The interconnect can be disabled if required. Waterballast upped to 140 litres. New price 48,500 Finnish Marks.

It was the winning glider at the 1976 World Gliding Championships in Räyskälä, Finland (Ingo Renner PIK-20B)
http://en.wikipedia.org/wiki/World_Gliding_Championships

PIK 20
The "A" model. 90 deg flaps, all glass. Early models had a 2-piece canopy.

Performance
Span15m
Length6.45m
Height1.39m
Wing Area10.0
Wing SectionWortmann FX-67-K-170/150
Aspect Ratio22.5
Empty Glider Mass220kg
All-Up Mass450kg
Water Ballast140kg
Load Factors?
Maximum L/D42
Stalling Speed35kt
Minimum Sinking Speed 0.66m/s
Max. Rough Air Speed130kt
Never Exceed Speed157kt